Tap Drill Chart for Number Screws
New Page 1This tap drill chart is for Number size taps. Both NC & NF Drill size recommendations are for 70-75% thread height. Drills produce a hole slightly larger then their normal size. Size obtained will depend on drill style, condition etc. You can find a easy to use formula for calculating Number Tap drill sizes on our Math Tricks Page
Tap Size | Tap Size & Pitch | Drill Size | Decimal | Tap Size & Pitch | Drill Size | Decimal | | 0-80 | 3/64 | .0469 | 6-32 | # 36 | .1065 | | 1-64 | # 53 | .0595 | 6-40 | # 33 | .1130 | | 1-72 | # 53 | .0595 | 8-32 | # 29 | .1360 | | 2-56 | # 50 | .0700 | 8-36 | # 29 | .1360 | | 2-64 | # 50 | .0700 | 10-24 | # 26 | .1470 | | 3-48 | # 47 | .0785 | 10-32 | # 21 | .1590 | | 3-56 | # 46 | .0810 | 12-24 | # 16 | .1770 | | 4-40 | # 43 | .0890 | 12-28 | # 15 | .1800 | | 4-48 | #42 | .0935 | | | | | 5-40 | # 38 | .1015 | | | | | 5-44 | # 37 | .1040 | | | |
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